All things being equal, of course 1 GB of data is better. Would you like to have $1,000 or $500? You need to do some research and find out which one works better in your area though, 1 gig of data when you can barely make a call and connect at 2g speeds is not very good.
That is not a lot of data, and for cell data, games will be a bit laggy due to latency. My smartphone tends to average 1.2-1.6 gig of data used a month with pretty much only email, a bit of web browsing and some facebook stuff. 2 gig is a lot better to get.